linkedin post 2021-05-25 04:40:52
EXCESS ENTROPY. “Entropy may be generated in the black-hole exterior as an organic part of the whole process; this extra entropy cannot be ignored.” https://lnkd.in/dAr7QTt View in LinkedIn
linkedin post 2021-05-25 04:39:45
UNNECESSARY AND INSUFFICIENT. “One might think that the law would hold if each small element of matter causes an increase in black-hole area at least equivalent to its own entropy. But this condition may be neither necessary nor meaningful.” https://lnkd.in/dAr7QTt View in LinkedIn
linkedin post 2021-05-27 04:32:07
BRILLIANT. “In this gedanken experiment, the thermal entropy of the tea disappears behind the black-hole horizon. Hence, at first glance, it seems that the second law of thermodynamics, which states that entropy cannot decrease, is violated in this physical process.” https://lnkd.in/d3sfhP6 View in LinkedIn
linkedin post 2021-05-27 04:30:09
TEA WITH MILK PLEASE. “The legend says that it all began with a cup of tea and two genius physicists, Professor John Archibald Wheeler and his young student Jacob David Bekenstein, who tried to figure out what happens to the second law of thermodynamics when the cup goes down a black hole.” https://lnkd.in/d3sfhP6 View in LinkedIn
linkedin post 2021-05-27 04:29:05
THE CONJECTURE. “Bekenstein’s generalized second law of thermodynamics: The role of the hoop conjecture, by Shahar Hod. Another relgem commenting on our featured and favoriteauthor. https://lnkd.in/d3sfhP6 View in LinkedIn
linkedin post 2021-05-26 04:39:21
Castle of Montfalcó Muralatt (near Lleida, Spain) was first mentioned in 1043 AD, and along with the nearby town is locked in Medieval time, giving an extraordinary sense of place. View in LinkedIn
linkedin post 2021-05-26 04:34:11
THOMAS WRIGHT (1711-1786) would declare himself “an enemy to the taking of any thing for granted, merely because a person of reputed judgment has been heard to say it absolutely is so.” He dared to imagine the solar system in extraordinary ways. https://www.brainpickings.org/2021/02/16/thomas-wright-original-theory/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+brainpickings/rss+ View in LinkedIn
linkedin post 2021-05-28 03:06:02
FIRST CHALLENGE. “In order to challenge the GSL, Bekenstein analyzed a gedanken experiment in which a finite-sized object with negligible self-gravity is assimilated into a black hole.” (GSL = the generalized second law of thermodynamics). https://lnkd.in/d3sfhP6 View in LinkedIn
linkedin post 2021-05-26 04:32:47
SO ENDS this first of a series of papers by Jacob Bekenstein, whose extraordinary work on black hole entropy had an enormous impact on astrophysics. This man used the sheer power of logic, imagination and mathematics to probe the unknowable, for nothing we know can penetrate a black hole and survive. https://lnkd.in/dAr7QTt View in LinkedIn
linkedin post 2021-05-28 03:05:16
SEEKING VALIDATION. “It is therefore of physical interest to consider gedanken experiments in order to test the validity of the GSL in various physical situations.” (GSL = the generalized second law of thermodynamics). https://lnkd.in/d3sfhP6 View in LinkedIn